This function retrieves the errno as it is known to the library.
The goal of this function is to make the code 100% portable, including
where the library is compiled with certain CRT library (on Windows) and
linked to an application that uses different CRT library.
This function retrieves the errno as it is known to the library. The goal of this function is to make the code 100% portable, including where the library is compiled with certain CRT library (on Windows) and linked to an application that uses different CRT library.